[1] McGill Univ, Dept Dent, Montreal, PQ H3A 2T5, Canada
[2] Univ Hosp Bretoneau, Paris V Montrouge, France
[3] Montreal Childrens Hosp, Dept Dent & Oral Maxillofacial Surg, Montreal, PQ H3H 1P3, Canada
[4] Montreal Childrens Hosp, Dept Dent, Montreal, PQ H3H 1P3, Canada